Whenever I do a defprotocol in the clojurescript repl, even a trivial one 
like

(defprotocol IFoo
 (foo [this]))

 it fails with an error `Can't change/establish root binding of: 
*unchecked-if* with set at line 1 <cljs repl>'.
Everything else seems to work as expected.

When compiled outside the repl, such as in a running project, defprotocol 
works fine.

This happens even in the bare bones cljs repl from following the Quickstart 
recipe
on the cljs wiki exactly, using the latest cljs.jar. The complete 
stacktrace is below
for reference.

This seems like a repl bug, but I'm open to other possibilities. Any 
thoughts would
be appreciated.


cljs.user=> (defprotocol IFoo (foo [this]))
clojure.lang.ExceptionInfo: Can't change/establish root binding of: 
*unchecked-if* with set at line 1 <cljs repl> {:file "<cljs repl>", :line 
1, :column 1, :tag :cljs/analysis-error}
    at clojure.core$ex_info.invokeStatic(core.clj:4617)
    at cljs.analyzer$error.invokeStatic(analyzer.cljc:576)
    at cljs.analyzer$analyze_seq_STAR__wrap.invokeStatic(analyzer.cljc:2420)
    at cljs.analyzer$analyze_seq.invokeStatic(analyzer.cljc:2441)
    at cljs.analyzer$analyze_form.invokeStatic(analyzer.cljc:2555)
    at cljs.analyzer$analyze_STAR_.invokeStatic(analyzer.cljc:2600)
    at cljs.analyzer$analyze.invokeStatic(analyzer.cljc:2617)
    at cljs.analyzer$analyze.invoke(analyzer.cljc:2605)
    at cljs.analyzer$analyze.invokeStatic(analyzer.cljc:2613)
    at cljs.analyzer$analyze.invoke(analyzer.cljc:2605)
    at cljs.analyzer$analyze.invokeStatic(analyzer.cljc:2612)
    at cljs.analyzer$analyze.invoke(analyzer.cljc:2605)
    at 
cljs.analyzer$analyze_do_statements_STAR_$fn__1249.invoke(analyzer.cljc:1406)
    at clojure.core$map$fn__4785.invoke(core.clj:2644)
    at clojure.lang.LazySeq.sval(LazySeq.java:40)
    at clojure.lang.LazySeq.seq(LazySeq.java:49)
    at clojure.lang.RT.seq(RT.java:521)
    at clojure.core$seq__4357.invokeStatic(core.clj:137)
    at 
cljs.analyzer$analyze_do_statements_STAR_.invokeStatic(analyzer.cljc:1405)
    at cljs.analyzer$analyze_do_statements.invokeStatic(analyzer.cljc:1408)
    at cljs.analyzer$fn__1254.invokeStatic(analyzer.cljc:1411)
    at cljs.analyzer$fn__1254.invoke(analyzer.cljc:1411)
    at clojure.lang.MultiFn.invoke(MultiFn.java:251)
    at cljs.analyzer$analyze_seq_STAR_.invokeStatic(analyzer.cljc:2416)
    at cljs.analyzer$analyze_seq_STAR__wrap.invokeStatic(analyzer.cljc:2419)
    at cljs.analyzer$analyze_seq.invokeStatic(analyzer.cljc:2441)
    at cljs.analyzer$analyze_form.invokeStatic(analyzer.cljc:2555)
    at cljs.analyzer$analyze_STAR_.invokeStatic(analyzer.cljc:2600)
    at cljs.analyzer$analyze.invokeStatic(analyzer.cljc:2617)
    at cljs.analyzer$analyze.invoke(analyzer.cljc:2605)
    at cljs.analyzer$analyze_seq.invokeStatic(analyzer.cljc:2443)
    at cljs.analyzer$analyze_form.invokeStatic(analyzer.cljc:2555)
    at cljs.analyzer$analyze_STAR_.invokeStatic(analyzer.cljc:2600)
    at cljs.analyzer$analyze.invokeStatic(analyzer.cljc:2617)
    at cljs.repl$evaluate_form.invokeStatic(repl.cljc:440)
    at cljs.repl$eval_cljs.invokeStatic(repl.cljc:576)
    at cljs.repl$eval_cljs.invoke(repl.cljc:563)
    at cljs.repl$repl_STAR_$read_eval_print__4908.invoke(repl.cljc:875)
    at cljs.repl$repl_STAR_$fn__4914$fn__4923.invoke(repl.cljc:914)
    at cljs.repl$repl_STAR_$fn__4914.invoke(repl.cljc:913)
    at cljs.compiler$with_core_cljs.invokeStatic(compiler.cljc:1154)
    at cljs.repl$repl_STAR_.invokeStatic(repl.cljc:851)
    at cljs.repl$repl.invokeStatic(repl.cljc:993)
    at cljs.repl$repl.doInvoke(repl.cljc:925)
    at clojure.lang.RestFn.invoke(RestFn.java:486)
    at user$eval220.invokeStatic(repl.clj:10)
    at user$eval220.invoke(repl.clj:10)
    at clojure.lang.Compiler.eval(Compiler.java:6927)
    at clojure.lang.Compiler.load(Compiler.java:7379)
    at clojure.lang.Compiler.loadFile(Compiler.java:7317)
    at clojure.main$load_script.invokeStatic(main.clj:275)
    at clojure.main$script_opt.invokeStatic(main.clj:335)
    at clojure.main$script_opt.invoke(main.clj:330)
    at clojure.main$main.invokeStatic(main.clj:421)
    at clojure.main$main.doInvoke(main.clj:384)
    at clojure.lang.RestFn.invoke(RestFn.java:408)
    at clojure.lang.Var.invoke(Var.java:379)
    at clojure.lang.AFn.applyToHelper(AFn.java:154)
    at clojure.lang.Var.applyTo(Var.java:700)
    at clojure.main.main(main.java:37)
Caused by: java.lang.IllegalStateException: Can't change/establish root 
binding of: *unchecked-if* with set
    at clojure.lang.Var.set(Var.java:221)
    at cljs.analyzer$fn__1299.invokeStatic(analyzer.cljc:1589)
    at cljs.analyzer$fn__1299.invoke(analyzer.cljc:1578)
    at clojure.lang.MultiFn.invoke(MultiFn.java:251)
    at cljs.analyzer$analyze_seq_STAR_.invokeStatic(analyzer.cljc:2416)
    at cljs.analyzer$analyze_seq_STAR__wrap.invokeStatic(analyzer.cljc:2419)
    ... 57 more





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